#include <QFileInfo>
#include <QListWidgetItem>

#include "version.h"
#include "LaunchingScreen.h"
#include "ui_LaunchingScreen.h"
#include "QSettingsCached.h"

#include "UIUtils.h"

LaunchingScreen *LaunchingScreen::inst = nullptr;

LaunchingScreen *LaunchingScreen::getDialog() {
  return LaunchingScreen::inst;
}

// Called (possibly multiple times) by EventFilter on MacOS, e.g.
// when the user opens files from Finder.
void LaunchingScreen::openFile(const QString& filename)
{
  QVariant v(filename);
  this->checkOpen(v, false);
  this->done(QDialog::Accepted);
}

LaunchingScreen::LaunchingScreen(QWidget *parent) : QDialog(parent)
{
  LaunchingScreen::inst = this;
  setupUi(this);

  this->setStyleSheet("QDialog {background-image:url(':/icons/background.png')} QPushButton {color:white;}");

  this->versionNumberLabel->setText("OpenSCAD " + QString::fromStdString(openscad_displayversionnumber));

  QStringList recentFiles = UIUtils::recentFiles();
  for (const auto& recentFile : recentFiles) {
    QFileInfo fileInfo(recentFile);
    auto item = new QListWidgetItem(fileInfo.fileName());
    item->setData(Qt::ToolTipRole, fileInfo.canonicalPath());
    item->setData(Qt::UserRole, fileInfo.canonicalFilePath());
    this->recentList->addItem(item);
  }

  for (const auto& category : UIUtils::exampleCategories()) {
    auto examples = UIUtils::exampleFiles(category);
    auto categoryItem = new QTreeWidgetItem(QStringList(gettext(category.toStdString().c_str())));

    for (const auto& example : examples) {
      auto exampleItem = new QTreeWidgetItem(QStringList(example.fileName()));
      exampleItem->setData(0, Qt::UserRole, example.canonicalFilePath());
      categoryItem->addChild(exampleItem);
    }

    this->treeWidget->addTopLevelItem(categoryItem);
  }

  connect(this->pushButtonNew, SIGNAL(clicked()), this, SLOT(accept()));
  connect(this->pushButtonOpen, SIGNAL(clicked()), this, SLOT(openUserFile()));
  connect(this->pushButtonHelp, SIGNAL(clicked()), this, SLOT(openUserManualURL()));
  connect(this->recentList->selectionModel(), SIGNAL(currentRowChanged(const QModelIndex&,const QModelIndex&)), this, SLOT(enableRecentButton(const QModelIndex&,const QModelIndex&)));

  connect(this->recentList, SIGNAL(itemDoubleClicked(QListWidgetItem*)), this, SLOT(openRecent()));
  connect(this->treeWidget, SIGNAL(currentItemChanged(QTreeWidgetItem*,QTreeWidgetItem*)), this, SLOT(enableExampleButton(QTreeWidgetItem*,QTreeWidgetItem*)));

  connect(this->treeWidget, SIGNAL(itemDoubleClicked(QTreeWidgetItem*,int)), this, SLOT(openExample()));
  connect(this->openRecentButton, SIGNAL(clicked()), this, SLOT(openRecent()));
  connect(this->openExampleButton, SIGNAL(clicked()), this, SLOT(openExample()));
  connect(this->checkBox, SIGNAL(toggled(bool)), this, SLOT(checkboxState(bool)));
}

LaunchingScreen::~LaunchingScreen()
{
  LaunchingScreen::inst = nullptr;
}

QStringList LaunchingScreen::selectedFiles() const
{
  return this->files;
}

bool LaunchingScreen::isForceShowEditor() const
{
  return this->forceShowEditor || this->files.isEmpty();
}

void LaunchingScreen::enableRecentButton(const QModelIndex&, const QModelIndex&)
{
  this->openRecentButton->setEnabled(true);
  this->openRecentButton->setDefault(true);
}

void LaunchingScreen::openRecent()
{
  QListWidgetItem *item = this->recentList->currentItem();
  if (item == nullptr) {
    return;
  }

  checkOpen(item->data(Qt::UserRole), false);
}

void LaunchingScreen::enableExampleButton(QTreeWidgetItem *current, QTreeWidgetItem *)
{
  const bool enable = current->childCount() == 0;
  this->openExampleButton->setEnabled(enable);
  this->openExampleButton->setDefault(true);
}

void LaunchingScreen::openExample()
{
  QTreeWidgetItem *item = this->treeWidget->currentItem();
  if (item == nullptr) {
    return;
  }

  checkOpen(item->data(0, Qt::UserRole), true);
}

void LaunchingScreen::checkOpen(const QVariant& data, bool forceShowEditor)
{
  const QString path = data.toString();
  if (path.isEmpty()) {
    return;
  }

  this->forceShowEditor = forceShowEditor;
  this->files.append(path);
  accept();
}

void LaunchingScreen::openUserFile()
{
  QFileInfo fileInfo = UIUtils::openFile(this);
  if (fileInfo.exists()) {
    this->forceShowEditor = false;
    this->files.append(fileInfo.canonicalFilePath());
    accept();
  }
}

void LaunchingScreen::checkboxState(bool state) const
{
  QSettingsCached settings;
  settings.setValue("launcher/showOnStartup", !state);
}

void LaunchingScreen::openUserManualURL() const
{
  UIUtils::openUserManualURL();
}
